Cylinder for mechanical driers.



No. 856,770. PATENTED JUN 11, 1907.

W. M. GUMMER.

CYLINDER FOR MECHANICAL DRIERS.

APPLIUA'IION man JAN, 1a. 1907.

A TTORNE Y5 tiohs running WILLIAM oonrise, or oL'EvirLANn, 01-110.

-CYL|NDEFi FOR MECHANICAL DRlERS.

Specification of Letters Patent.

Patented June 1 1, 1907.

Application filed January 13,1907. Serial 1%- 362,858.

a citizenof' the United States, residing at Cleveland, in the county of ()uyahoga and State of Ohio, have invented certainnew and useful Im rovements in Cylinders for Mechanic'al riers; and I do declare that the following is a full, clear, and exact descriptionof, the invention, which. will enable othersskilled in the art-to which it-appertains to make and use the same.

- My invention relates to cylinders for mechanical driers, and the invention consists in a-cylinder constructed of a plurality of secthe full length thereof and provided 1 draft inlets for' air and the products of combustion extendin the full length of the cylinder between sai( sections,

the said sections being curved to the segment of a c rcle in cross-sectlon and spaced apart along their overlapping edges and provlded with guards inside over said draft inlets topr'event material from working out of the" cylinder and to provide a draft chamber, all

substantially as shown and described and particularly pointed outin the claims.

In the accompanying drawings Fi ure l is alongitudinal sectional elevation o a drier gontaming my invention and Fig. 2 is a cross section thereof.

.Theinvent'ion herein res ides more particularly in drying cylinder 0 as a new and practical article of manufacture and sale, the

. other parts shown being old in the main.

The said cylinder is constructed. in several, .sectlons longitudinally, three in this instance,

2-, 3 and 4, respectively, running the full length 'of the cylinder and constituting. the.

entire body thereof. The said sections themselves may be constituted in'one piece their full length, or of several pieces riveted together, and all are curved to the same cross section andv arranged. to meet along their edges lengthwise, except that each section comes oppositeanother at one edge and is spaced apart from the next section at its other edge, and the several sections rigidly united and constituted into a complete cyl inder by means of longitudmal bars or spacingpieces B. The said pieces or bars are located. between the said sections out-- vside the containing pomtion of the cylinder and between adjacent \efl stantially as shown. Th ltlisthe saidstrips llges thereof, subor pieces occupy a space between the inner edge of one section and the outer edge of the other section at that'point, and said edges or edge portions of sections are spaced apart by said pieces sufficiently to provide free admission of air and products of combustion from furnace F. Furthermore, it will be observed that the said connecting hars or pieces B have the shape, preferably, of Z to both sections so as to give perfect rigidity and strength to the cylinder. Said bars or pieces also are provided with draft holes or 0 )enings 2 through the web thereof, as a ove indicated, and the said bars and series of openings therein run lengthwise of the cylinder. But this in itself would not be suflicient to m'akea cylinder of this style operative or practical for drying purposes because the drying material is tossed and tumbled about in the cylinder in such manner, and is of such subtle quality usually, that there would be excessive waste and loss through the draft 'iopenings. Hence the need of auxiliary maintain a-free circulation'through the cylinder of the drying medium. To these ends, therefore, the said openings are guarded and the material confined in the cylinder so far as said openings are concerned by means of two parallel wallsG and H, respectively forming an inside draft'chamber; The said walls have plate proper, and is bent to L shape or right angles in cross section and secured along its base to the outer cylinder section back from the entrance thereto through openings 5 a distance relatively. as shown, so that its right angled overhangingportion or .cover 6 overlaps the said chamber and shields the same from any direct fall ofthe material from above. Wall plate H stan'ds'inward from plate G and is attached along the edge of the inner cylinder section and is sufficiently lower than plate or wall H to leave a draft space I over the same beneath the cover '6 of plate G, said overhangin portion extending inward beyond plate H ar enough toprevent material dropping from above behind thesame when the said parts are turned some distance past the bottomof the cylinder. Further around in the direction of rotation as indicated by the arrows, this exact protection does not obtain, but then the longitudinal draft means to confine the material as well as to the form of plates, and plate G is the guardearns in cross section, and are firmly riveted .5 v speed determined upon when the cylinder is channels are not in position which exposes them unduly to the falling material, and I in tend that a percentage of the material shall drop thereon so as to promote the drying of the same. rially affecting the inflow of air because of the peculiar construction and operative relations of the several draft chambers within or be' hind plates G and H, and any material that works into said draft chambers must inevitably fall back into thebody of the'cylinder the cylinder relatively near to the side there-:

when rotatedaround far enough to make such discharge certain. But in no case can any of the material escape from said sheltered draft chamber through inlet passages 5, and any exposure of matetial-occurring on or about the walls of the draft chambers will only promoteits drying advantage of the system.

The guard plates G and H are disposed in the cylinder in such positions relatively that they take. the place and do the service of lift blades L, of which three are shown intermediately.

Among the advantages of this construction of cylinder over others .familiar to meare, first, the taking in of the drying medium into of, where it necessarily is drawn through the material as the material is tossed or cascaded 1n the cylinder. This could not occur to any such advantageous degree if the heating medium or agent were delivered at or near the center of the cylinder Where at anyrate the suction from the blower at the front of the cylinder is most active, and to which the air naturally works. It will be seen that the undried material about the side of the cylinder back of such approximately central inlets would get no practical benefit from the infiowing air, but b establishing the inlets near the'surfac'e othe cylinder all around the exposure of the material to the drying agent is greatly. increased and the machine is ;thus rendered that much more efiicient without increasing the heat units. Furthermore, this construction does away with all obstructions to. the working of the material toward the discharge end of the cylinder, which is necessary to maintain at a rate of set,"and the'entire interior of the cylinder is clear ,except for the air shaft chambers which, being lengthwise do not impede the fiowofit'he material.

VZh'at I claim is:

, :1".-= A drying cylinder formed of a plurality of segmental sections spaced apart at their edges, and rigid connecting pieces extending This may be done without mateand operate to the sear/"rd the full length 'of the cylinder between the edges of said sections and provided with draft openings.

2. A cylinder for a drying apparatus consisting of a plurality of sections extending from end to end thereof, s acing pieces running lengthwise of the or ges' between said sections and rigidly uniting said sections and provided with inlet openings for the drying.

medium, and longitudinal draft chambers for said openings within the cylinder.

3. A drying cylinder in sections the full length thereof segmentally curved in cross section, said sections separated along both edges, spacing pieces between the said edges provided with draft openings, and a covered draft chamber lengthwise next within said openings provided with side and top guard V ying chamber having longitudinal intervals about its periphery ex-v openin,

tending tram end to end thereof, rigid connee-ting pieces located in said openings and provided with draft holes, and draft chain'- hers located within said cylinder into which said draft holes discharge provided with parallel walls of different elevation and the higher of said walls having a right angled portion extending across the edge of the lower wall and apart therefrom.

5. A drying cylinder consisting of several longitudinal segmental sections having their meeting edges spaced apart and a walled draft chamber projecting: inward the full length of said cylinder at the intersection of said sections and having a side opening parallelly arranged to the axis of the cylinder.

6. A drying cylinder formed in segmental I sections lengthwise and having draft openings between the meeting edges of said sections, and walled draft chambers over said openings constructed to hft the material be- IOC ing dried and adapted to prevent the escape tion in the presence of two witnesses,

WILLIAM M. Gunman,

Witnesses R. B. MosER, F. C. MUSSUN.

nder having parallel walls on oppo- 

